Electronic device

Abstract

An electronic device includes a substrate, a first insulating film on the substrate, a second insulating film on the first insulating film, first and second coils respectively in the first and second insulating films, first and second terminals, and first and second connection conductors. The first and second insulating films contact each other so that the first and second coils are magnetically coupled. The first insulating film includes a first non-contact portion not contacting the second insulating film. One of the first and second insulating films includes a second non-contact portion not contacting the first or second insulating film. The first terminal is provided on the first non-contact portion and electrically connected to the first coil. The second terminal is provided on the second non-contact portion and electrically connected to the second coil. The first and second connection conductors are connected to the first and second terminals, respectively.

What is claimed is: 
     
       1. An electronic device, comprising:
 a first substrate; 
 a first insulating film provided on the first substrate; 
 a first coil provided in the first insulating film; 
 a second insulating film provided on the first insulating film; 
 a second coil provided in the second insulating film, the first insulating film and the second insulating film contacting each other so that the first coil and the second coil are magnetically coupled, the second insulating film having a front surface contacting the first insulating film, the second insulating film contacting a front surface of the first insulating film, the first insulating film including a first non-contact portion not contacting the second insulating film, one of the first and second insulating films including a second non-contact portion not contacting the second or first insulating film; 
 a first terminal provided on the front surface of the first insulating film at the first non-contact portion, the first terminal being electrically connected to the first coil; 
 a second terminal provided on the front surface of the second insulating film at the second non-contact portion, the second terminal being electrically connected to the second coil; 
 a resin member sealing the first substrate, the first insulating film, the second insulating film, the first terminal, and the second terminal; 
 a first external terminal provided on a first surface region of the resin member and electrically connected to the first terminal; 
 a second external terminal provided on a second surface region of the resin member and electrically connected to the second terminal, the second external terminal being apart from the first external terminal; 
 a first contact plug electrically connecting the first terminal and the first external terminal, the first contact plug extending straight in the resin member toward the first terminal; and 
 a second contact plug electrically connecting the second terminal and the second external terminal, the second contact plug extending straight in the resin member toward the second terminal. 
 
     
     
       2. The device according to  claim 1 , further comprising:
 a second substrate provided on the second insulating film, 
 the second insulating film including a portion positioned between the first insulating film and the second substrate. 
 
     
     
       3. The device according to  claim 1 , further comprising:
 a circuit provided between the first substrate and the first insulating film and electrically connected to the first coil. 
 
     
     
       4. The device according to  claim 3 , wherein
 the circuit is electrically connected to the first external terminal via the first terminal and the first contact plug. 
 
     
     
       5. The device according to  claim 1 , wherein
 the resin member has a top surface and a bottom surface opposite to the top surface, the first external terminal being provided on the first surface region in the top surface, the second external terminal being provided on the second surface region in the bottom surface. 
 
     
     
       6. The device according to  claim 1 , wherein
 the resin member includes a surface crossing a direction from the first substrate toward the second insulating film, the surface of the resin member including the first surface region and the second surface region, and 
 the first external terminal and the second external terminal are provided on the surface of the resin member. 
 
     
     
       7. The device according to  claim 5 , further comprising:
 An electronic device, comprising: 
 a first substrate; 
 a first insulating film provided on the first substrate; 
 a first coil provided in the first insulating film; 
 a second insulating film provided on the first insulating film; 
 a second coil provided in the second insulating film, the first insulating film and the second insulating film contacting each other so that the first coil and the second coil are magnetically coupled, the second insulating film having a front surface contacting the first insulating film, the second insulating film contacting a front surface of the first insulating film, the first insulating film including a first non-contact portion not contacting the second insulating film, one of the first and second insulating films including a second non-contact portion not contacting the second or first insulating film; 
 a first terminal provided on the front surface of the first insulating film at the first non-contact portion, the first terminal being electrically connected to the first coil; 
 a second terminal provided on the front surface of the second insulating film at the second non-contact portion, the second terminal being electrically connected to the second coil; 
 a first connection conductor connected to the first terminal, the first connection conductor being electrically connected to the first coil via the first terminal; 
 a second connection conductor connected to the second terminal, the second connection conductor being electrically connected to the second coil via the second terminal; 
 a resin member sealing the first substrate, the first insulating film, the second insulating film, the first connection conductor, and the second connection conductor; 
 a first external terminal provided on a first surface region of the resin member and electrically connected to the first connection conductor; 
 a second external terminal provided on a second surface region of the resin member and electrically connected to the second connection conductor, the second external terminal being apart from the first external terminal; and 
 a third substrate including the first external terminal and the second external terminal, 
 the resin member being provided on the third substrate, 
 the first connection conductor and the second connection conductor extending in the resin member, 
 the first connection conductor electrically connecting the first terminal and the first external terminal, 
 the second connection conductor electrically connecting the second terminal and the second external terminal. 
 
     
     
       8. An electronic device, comprising:
 a first substrate; 
 a first insulating film provided on the first substrate; 
 a first coil provided in the first insulating film; 
 a second insulating film provided on the first insulating film; 
 a second coil provided in the second insulating film, the first insulating film and the second insulating film contacting each other so that the first coil and the second coil are magnetically coupled, the second insulating film having a front surface contacting the first insulating film, the second insulating film contacting a front surface of the first insulating film, the first insulating film including a first non-contact portion not contacting the second insulating film, one of the first and second insulating films including a second non-contact portion not contacting the second or first insulating film; 
 a first terminal provided on the front surface of the first insulating film at the first non-contact portion, the first terminal being electrically connected to the first coil; 
 a second terminal provided on the front surface of second insulating film at the second non-contact portion, the second terminal being electrically connected to the second coil; 
 a first connection conductor connected to the first terminal, the first connection conductor being electrically connected to the first coil via the first terminal; 
 a second connection conductor connected to the second terminal, the second connection conductor being electrically connected to the second coil via the second terminal; 
 a resin member sealing the first substrate, the first insulating film, the second insulating film, the first connection conductor, and the second connection conductor; 
 a first external terminal provided on a first surface region of the resin member and electrically connected to the first connection conductor; 
 a second external terminal provided on a second surface region of the resin member and electrically connected to the second connection conductor, the second external terminal being apart from the first external terminal; 
 a third substrate including the first external terminal and the second external terminal; 
 a control element electrically connected to the first coil via the first connection conductor; and 
 a third connection conductor electrically connecting the control element and the first external terminal, 
 the resin member being provided on the third substrate, 
 the first connection conductor, the second connection conductor, and the third connection conductor extending in the resin member, 
 the second connection conductor electrically connecting the second terminal and the second external terminal. 
 
     
     
       9. The device according to  claim 8 , wherein
 the first substrate is mounted on the control element. 
 
     
     
       10. The device according to  claim 8 , further comprising:
 a heat dissipation base connected to the control element, 
 the resin member being provided between the heat dissipation base and the third substrate. 
 
     
     
       11. The device according to  claim 10 , wherein
 the first substrate is connected to the heat dissipation base, the first substrate being apart from the control element. 
 
     
     
       12. An electronic device, comprising:
 a first substrate; 
 a first insulating film provided on the first substrate; 
 a first coil provided in the first insulating film; 
 a second insulating film provided on the first insulating film; 
 a second coil provided in the second insulating film, the first insulating film and the second insulating film contacting each other so that the first coil and the second coil are magnetically coupled, the second insulating film having a front surface contacting the first insulating film, the second insulating film contacting a front surface of the first insulating film, the first insulating film including a first non-contact portion not contacting the second insulating film, one of the first and second insulating films including a second non-contact portion not contacting the second or first insulating film; 
 a first terminal provided on the front surface of the first insulating film at the first non-contact portion, the first terminal being electrically connected to the first coil; 
 a second terminal provided on the front surface of the second insulating film at the second non-contact portion, the second terminal being electrically connected to the second coil; 
 a first connection conductor connected to the first terminal, the first connection conductor being electrically connected to the first coil via the first terminal; 
 a second connection conductor connected to the second terminal, the second connection conductor being electrically connected to the second coil via the second terminal; and 
 a first resin member covering the second insulating film and the first and second connection conductors on the first insulating film, 
 the second connection conductor being connected to the second terminal on the front surface of the first insulating film, 
 the first connection conductor and the second connection conductor including end surfaces not covered with the first resin member. 
 
     
     
       13. The device according to  claim 12 , further comprising:
 a second resin member covering the first substrate, 
 the first insulating film and the second insulating film being provided between the first resin member and the second resin member, 
 the first substrate including a first portion, and a second portion apart from the first portion, 
 the first insulating film including a portion between the first connection conductor and the first portion of the first substrate and another portion between the second connection conductor and the second portion of the first substrate, 
 the second resin member including a portion positioned between the first portion and the second portion, 
 the first coil and the second coil being positioned between the first resin member and the portion of the second resin member. 
 
     
     
       14. The device according to  claim 12 , wherein
 the first terminal and the first connection conductor are combined into one body, and 
 the second terminal and the second connection conductor are combined into another one body.